To determine the fastest growing companies, Deloitte calculated the revenue growth percentage over five years, from 2001-2005.

Cbeyond came in at #22, M5 at #54 and Broadsoft at #99. M5 made the list in no small part due to its blazing revenue growth of 4,445% -- more than double the average increase of 2,145% among the 500 companies on the list.